I know this thread is only 6 years old but it came up when searching on converting over to LPG. I seen this conversion is very popular in Australia and New Zealand as well as parts of Europe and probably Canada but not so much in the U.S.A from what I can tell. At least not for average consumers.

Looks like if there was some way to buy mass quantities it sells at less than $1.00 per gallon according to this website:
Propane - Daily Price - Commodity Prices - Price Charts, Data, and News - IndexMundi

But according to this website, there are only 15 retail outlets in the 4th most populous city in the nation (Houston,TX). The LPG seems to sell as low as $2.50 to over $4.39. I don't get it. Is there that much markup in this stuff? The gas has been falling on the commodities market and there is a lot of talk of having a natural gas glut, so what gives. Maybe its time to open up an LPG station?

I was tinkering with excel and was playing around with what-ifs on converting a 460 to run on LPG. I really don't have a good handle on the cost but I figure somewhere between $1,000-$2,000 should cover it and might even provide a dual gasoline / LPG system. Maybe I'm dreaming. The lower the MPG, the "quicker" the payback on converting. At a conservative $2.60 / gallon for LPG vs $3.75 for Gasoline and a MPG reduction with LPG of around 80% of gas, its looking like 30,000 mile would be the distance needed to pay for a $1500 conversion cost. A better system might yield 90% rather an 80% and that drastically cuts down the payback period.

Does this even look right?

<a href="http://www.freeimagehosting.net/4yl2e"><img src="http://www.freeimagehosting.net/newuploads/4yl2e.jpg"></a>

Anybody converting to LPG?

Propane - Daily Price - Commodity Prices - Price Charts, Data, and News - IndexMundi

Public Liquefied Propane Gas (LPG) stations and prices in Houston, TX

What about Gov't incentive or tax credits converting?